Geosynthetics August/September 2020 - 34
PVC sheet piling for cutoff and containment barriers
FIGURE 5 Concrete panel MSE wall and PVC sheet pile cutoff wall under
construction at the Cardinal Fly Ash Pond Dam
raising the dam. A mechanically stabilized earth (MSE) wall system using geosynthetic reinforcement and reinforced
full-height concrete panels formed the
upstream and downstream faces to raise
the dam 13 feet (4 m). For seepage containment, a cement-bentonite slurry
wall was constructed, which penetrated
into the existing clay core. A PVC sheet
pile wall was then inserted 30 feet (9 m)
through the slurry wall and extended
up 8 to 13 feet (2.4 to 4 m) to the top
of the raised dam in between the MSE
reinforced zones. The use of PVC sheet
pile allowed the cutoff wall to be a continuous element, eliminating the need
for a horizontal joint, and was flexible
enough to tolerate anticipated differential settlement. The benefits of the
method chosen also included a reduced
construction schedule to a single season,
"Avoidance of weather sensitive materials, such as clay soils which could slow
the construction schedule" (Rowland
and Evans 2014), redundancy for seepage protection and reduced overall project cost. Figure 5 shows the PVC sheet
pile wall installed and the MSE wall
under construction.
Florida Gas Plant site
FIGURE 6 PVC sheet wall installed at the Florida Gas Plant site
34
The Florida Gas Plant site located in
Houghton County, Mich., is a former
manufactured gas plant (MGP), which
historically released coal tar waste into
a drainage ditch that received seasonal
flows of water into a nearby creek.
Residential areas, a wetland and commercial businesses are adjacent to the
site. At the Florida Gas Plant site, off-site
migration of coal tar and dense and light
nonaqueous phase liquids (D/LNAPLs)
and organic chemicals posed a threat
to groundwater, wetlands and nearby
residents. Based on the results of a site
investigation, engineers recommended
installation of a cutoff wall. While
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Geosynthetics August/September 2020
Table of Contents for the Digital Edition of Geosynthetics August/September 2020
Geosynthetics August/September 2020 - Cover1
Geosynthetics August/September 2020 - Cover2
Geosynthetics August/September 2020 - 1
Geosynthetics August/September 2020 - 2
Geosynthetics August/September 2020 - 3
Geosynthetics August/September 2020 - 4
Geosynthetics August/September 2020 - 5
Geosynthetics August/September 2020 - 6
Geosynthetics August/September 2020 - 7
Geosynthetics August/September 2020 - 8
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Geosynthetics August/September 2020 - 34
Geosynthetics August/September 2020 - 35
Geosynthetics August/September 2020 - 36
Geosynthetics August/September 2020 - 37
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Geosynthetics August/September 2020 - 40
Geosynthetics August/September 2020 - 41
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Geosynthetics August/September 2020 - 45
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Geosynthetics August/September 2020 - 48
Geosynthetics August/September 2020 - Cover3
Geosynthetics August/September 2020 - Cover4
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